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Multi-path weakening method and device based on VMD algorithm

A multi-path and algorithmic technology, applied in measuring devices, calculations, computer-aided design, etc., to achieve simple modeling, avoid modal aliasing problems, end-point effects, and fewer parameters

Pending Publication Date: 2021-06-08
SOUTHEAST UNIV
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Problems solved by technology

[0005] Purpose of the invention: Aiming at the disadvantage that the traditional MHM algorithm cannot deal with the influence of noise on the accuracy of the multipath model, the MHM_V model based on the VMD and MHM algorithm is proposed by using the spatial repeatability of the multipath delay in a fixed environment to improve multipath modeling accuracy, thereby improving the reliability, success rate and accuracy of GNSS solutions

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  • Multi-path weakening method and device based on VMD algorithm
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  • Multi-path weakening method and device based on VMD algorithm

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[0035] The present invention will be further described below in conjunction with the accompanying drawings.

[0036] Such as figure 1 As shown, an improved multipath attenuation method disclosed in the embodiment of the present invention firstly uses the single-difference observation model to calculate the single-difference residuals of the carrier and pseudorange observation values ​​of all satellites for the historical observation data; secondly, the VMD algorithm is used to obtain The multi-path delay is separated from the single-difference residual of the observation value, and the multi-path correction model is established, which is stored in the database; finally, according to the principle of the nearest elevation angle and azimuth angle, and according to the spatial repeatability of the multi-path, the current observation value is Multipath correction. The method comprises the following specific steps:

[0037] Step 1) Using the single-difference observation model, c...

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Abstract

The invention discloses a multi-path weakening method based on a VMD algorithm. The invention provides an improved multipath weakening method (called MHMV method) based on VMD (variational mode decomposition) and an MHM algorithm by utilizing the spatial repeatability of multipath delay in a fixed environment aiming at the defect that the traditional MHM algorithm cannot well process the influence of observation value noise on the precision of a multipath correction model. Firstly, a VMD algorithm is used for eliminating carrier noise in single-difference residual errors, multi-path delay is extracted, and therefore a multi-path correction database of the previous day or multiple days is established. The current pseudo-range and the original carrier observation value are corrected according to the principle that the elevation angle and the azimuth angle are closest so as to weaken the influence of multiple paths on ambiguity fixation and positioning precision. Finally, the model is applied to bridge deformation monitoring.

Description

technical field [0001] The invention relates to the technical field of multipath weakening applied to a static environment by Global Navigation Satellite System (GNSS), in particular to a multipath weakening method and device based on a VMD algorithm. Background technique [0002] Global Navigation Satellite System (GNSS) has been widely used in many high-precision positioning fields, including traditional surveying and mapping, deformation monitoring, etc. For multipath delay, because it is difficult to parameterize and cannot be eliminated or weakened by differential means, it has become the most important source of error in GNSS high-precision applications. [0003] According to the existing research, the multipath delay is only related to the relative position of the satellite and the reflector, and because the satellite orbit is repeated, the multipath delay is repetitive in both time and space. For static or quasi-static (bridges, etc.) environments, there are mainly ...

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Application Information

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IPC IPC(8): G06F30/20G01S19/22G01S19/37G01S19/44G06F119/10
CPCG06F30/20G01S19/22G01S19/37G01S19/44G06F2119/10
Inventor 高成发张瑞成赵庆朋子涵尚睿
Owner SOUTHEAST UNIV
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